Overhead-line material for electrical railways.



WITNESSES:

' H. P. DAVIS.

OVERHEAD LINE MATERIAL FOR BLEGTRIOAL BAILWAYS.

APPLICATION FILED NOV. 8, 1907.

Pat ented Sept. 14, 1909.

2 SHEETS-SHEET 1.

INVENTOR ATTOhNEY H. P. DAVIS. OVERHEAD LINE MATERIAL P03 ELECTRICALRAILWAYS..

APPLICATION FILED NOV. 8, 1907.

933,747, Patented Sept. 14, 1909.

2 SHEETS-SHEET 2.

WITNESSES: 7igvEmoR (iffim BY i v t ATTORNEY high speed sliding or bowtrolleys and that.

UNITED STATES PATENT OFFICE.

HARRY P. DAVIS, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR, BY MESNEASSIGNMENTS, TO WESTINGHOUSE ELECTRIC & MANUFACTURINGCOMPANY, OF EASTPITTSBURG,

PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

Specification of Letters Patent.

Patented Sept. 14, 1909.

Application filed November 8, 1907. Serial No. 401,274.

To all whom it may concern:

Be it known that I, HARRY P. DAVIS, a citizen of the United States, anda resident of Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in Overhead-Line Material for Electrical Railways, of which the following is aspecification.

My invention relates to electric trolley line construction and it hasfor its object to provide a section-break insulator for suchconstruction that shall be-simple and durable and adapted for use inconnection with shall embody suitable switching devices for normallybridging theinsulating parts.

In the construction of trolley lines for electric railways it is oftendesirable to divide the line into a series of sections which areinsulated from each other and which may be connected through suitableswitching devices, under normal operating conditions. An arrangement ofthis kind is specially advantageous when the trolley line voltage isrelatively high and, in order to successfully divide the line as aboveindicated, a section-break insulator must be provided which is capableof withstanding the mechanical tension in the line and is also capableof resisting the electrical strain imposed by the electromotive force ofthe line.

The section-break insulator of my present invention is speciallyconstructed in view of the aforesaid requirements, and is so arrangedthat a sliding or bow trolley may pass over it without becomingelectrically disconnected from the supply line, switching devices beingalso so embodied in it as to avoid the necessity of complex andexpensive circuit interrupters such as are usually connected in circuitswhich shunt a section-break.

Figure 1, of the accompanying drawings, is a plan view and Fig. 2 is aside elevation of a section-break insulator and switching devicearranged in accordance with my invention, and Figs. 3, 1, 5, and 6 aredetail views, on a larger scale, of the device shown in Figs. 1 and 2.

Referring to the drawings, the device here illustrated comprises a pairof similar clamping end members 1 and 2 to which the extremities oftrolley conductors (not shown) are connected and a body bar 5 to blades10 and 11.

which the clamping end members are secured. The body bar 5 is ofinsulating material and is provided with, and is stiffened by, a centercasting 7 which is shown in cross sect-ion in Fig. 4. The casting 7 isprovided with bifurcated ear projections 8 and 9 to which the switchblades 10 and 1] are pivotally secured and the clamping end members 2are provided with switch jaws 12, 13, 14, and 15, which are illustratedin detail in Figs. 5 and 6, and which are adapted to receive the outerends of the switch the switch jaws diverge, as shown in Fig. 6, so thatthe switch arms or blades may be guided into place in closing theswitches.

The switch blades are preferably of anglesection, the portions which arein the planes .of the switch jaws being longer than the portions whichlie in the planes at right angles thereto. As illustrated, the shorterportions of the blades have rounded ends as indicated at 3 in order thatthe sliding or bow trolley contact shoe may pass smoothly from theextremities of the trolley conductors onto the blades. The lower surfaceof the body bar 5 is rounded laterally so that it may be engaged by thetrolley contact shoe when the switches are open.

The center casting illustrated in Fig. 4, is provided with a sleeveprojection 16 having a set screw 17 by which a feeder conductor may beclamped to the casting. This casting may preferably be made of brass orother material which is a relatively good conductor of electricity.

The ends of the trolley line conductors are secured to the end clampingmembers by a plurality of bolts 18, substantially as illustrated anddescribed in a co-pending application for Section-break insulators filedJune a, 1906, and bearing Serial No. 320,138.

The switch blades 10 are provided with holes 19 near their free ends toreceive a hook which may be mounted upon one end of a pole andmanipulated by an attendant to open and close the switches.

Then the switches are both thrown in the same direction, the feedercircuit is con- The outer extremities of v casting, both sections arecut oil from the feeder conductor.

The device illustrated may obviously be mounted in a vertical as well asin a horizontal plane and it is conceivable that various modificationsin the size and arrangement of parts may be effected Within the scope ofmy invention.

I claim as my invention:

1. A section-break device for trolley conductors comprising aninsulating bar, end bracketsor clamping members, an intermediate memberof conducting material, and a plurality of switch blades independentlysupported by the intermediate member.

2. A section-break device for trolley conductors comprising end clampingmembers to which the extremities of trolley conductors are secured, abody bar of insulating material connecting the end members, anintermediate member of conducting material, and switch blades pivotallymounted on the intermediate member and adapted to electrically connecteither one or both of the end members to the intermediate members.

3. A section-break device for trolley conductors comprising anon-conducting bar having end clamps of conducting material to which theextremities of an interrupted trolley conductor are secured, anintermediate member of conducting material having a sleeve projectionand ear projections, and switch blades pivotally secured to the earprojections and adapted to connect either one or both of the end membersto the intermediate member.

4. A section break device for trolley conductors comprising aninsulating bar having end brackets provided with wire-clamping devicesand switch jaws, an intermediate member and switch blades pivotallymounted thereon and respectively adapted to engage the switch jaws oneither end bracket. 5. In a section break device, the combination withan insulating bar having conducting brackets provided with wire-clampingdevices and side switch contact terminals and an intermediate conductingmember, of a pair of switch members supported by said intermediatemember and respectively adapted to make engagement with a contactterminal on either bracket.

In testimony whereof, I have hereunto subscribed my name this 28th dayof Oct., 190

HARRY P. DAVIS.

WVitnesses:

CAROLINE E. SMYERS, BIRNEY HINES.

